Agree - why the low ratings?
This movie is, of course rated lower than 'Miss Congeniality'. Not quite sure why the reviews and ratings of this are so low. Is it because they expected Bill Murray to do 1 hour and 45 minutes of one liners? It's typical Jarmusch aloofness and he does it well. He's great at nailing down the character traits early on. Adam Driver is especially good with his dry, matter of fact, nonchalant dialogue.
I found it pretty hilarious in parts. There are clear nods to Trump, climate change and materialistic throwaway culture and there are lots of tributes to films and directors. Iggy Pop's character is called Samuel M Fuller, and the motel owner was called Perkins!
It is oddly meta in places and there isn't a strong ending, but it's worth a watch.